Caligene Dragons have long been considered omens of death—reinforced by the skeletal markings on their bodies. They exert a malignant force on the world around them, causing other living things to slowly waste away in their presence. Caligenes favor the seasons of summer and autumn, disappearing entirely from the forests they inhabit during winter and spring. These malevolent dragons are physically weak, though this is countered by their natural stealthiness and alarming speed—enabling them to close in on large targets quickly and silently to create ambushes from which prey cannot escape.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Cerberuus is a dragon whose existence has only been confirmed in rumours and swindled stories. He appears as a fleeting shadow during the summer months and vanishes by the first snow fall. Over the years, vague descriptions of him have eventually been collected to reveal that he was a Caligene dragon. A breed whose habits of draining the life around them have led to many avoiding these dragons for safety.

Only one dragon has dared to speak to him, but he wasn't thinking clearly at the time due to many fermented berries and grapes he had ingested prior.

The dragon had been returning home, when he met Cerberuus, boldly standing in his path. The tale has been embellished over the years. The gems of truth are the only constant. Cerberuus is a shy figure, who only approached the other dragon because he saw his compromised mental state. He used the opportunity to tease and laugh at him, revealing himself to be a cowardly fellow when he retreated at the other dragon's single retaliation.